package com.qf.Filter;


import com.qf.pojo.User;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebFilter("/findAll")
public class LoginFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        User user =(User) request.getSession().getAttribute("user");
        //通过从session域中拿值，判断有没有登录
        if (user!=null) {
            //放行
            filterChain.doFilter(request, response);
        }else {
           response.sendRedirect("/login.jsp");
        }
    }

    @Override
    public void destroy() {

    }
}
